package com.lagou.rpc.provider.server;

import com.lagou.rpc.provider.handler.RpcServerHandler;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * netty服务启动类
 */
@Service
public class RpcServer implements DisposableBean {

    private NioEventLoopGroup bossGroup;

    private NioEventLoopGroup workerGroup;

    @Autowired
    RpcServerHandler rpcServerHandler;

    public void startServer(String ip,int port){
        try {
            //1、创建线程组
            bossGroup = new NioEventLoopGroup(1);
            workerGroup = new NioEventLoopGroup();
            //2、创建服务启动助手
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            //3、设置参数
            serverBootstrap.group(bossGroup,workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            ChannelPipeline pipeline = socketChannel.pipeline();
                            //向pipeline添加编解码器
                            pipeline.addLast(new StringDecoder());
                            pipeline.addLast(new StringEncoder());
                            //添加handler处理类
                            //todo
                            pipeline.addLast(rpcServerHandler);
                        }
                    });
            //4、绑定端口
            ChannelFuture channelFuture = serverBootstrap.bind(ip, port).sync();
            System.out.println("==========服务端:"+ip+":"+port+"====启动成功==========");
            //监听关闭通道
            channelFuture.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            if(bossGroup!=null){
                bossGroup.shutdownGracefully();
            }
            if (workerGroup!=null){
                workerGroup.shutdownGracefully();
            }
        }
    }

    //资源关闭方法
    @Override
    public void destroy() throws Exception {
        if(bossGroup!=null){
            bossGroup.shutdownGracefully();
        }
        if (workerGroup!=null){
            workerGroup.shutdownGracefully();
        }
    }
}
